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Power systemPower system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090045776, Power system. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention generally relates to a power system applied to portable electrical tools, more particularly to a power system, which provides power to the portable electrical tools and a power-store device simultaneously, so that the power-store device can then stores power in order to provide power to the portable electrical tools without an external power source. 2. Description of the Prior Art A battery of the accumulator in prior arts supplies a limited range of voltage values, and therefore the application, such as small electric hand torch, small electric appliance, is limited as well; otherwise, an electric saw for hewing a trunk can not be applied by such prior art. The modern application for supplying power to electrical tools is by generators, no matter outdoor or indoor. Or, electrical tools are electrically connected to indoor outlets by means of power lines. The two ways may have the disadvantages as follows: 1. A generator is hardly moved due to its heavy weight. If a working place is a country side, a vehicle is a must. On the other hand, the generator is operated by an engine, which is noisy so as to always bother people around. 2. Power lines are suitable to outdoor works but causes inconveniences and dangers to pedestrians. The cost to the power lines is another important factor; further that, the lengths of the power lines shall limit the working areas of the electrical tools. Therefore, how to figure out the disadvantages of prior arts is an important issue to the skilled people in the art. SUMMARY OF THE INVENTIONThe disadvantages of the prior arts to be solved are listed as below: 1. By using a generator to supply power to electrical tools, the heavy weight of the generator is a trouble for transportation; lousy noise from the generator is not expected as well. 2. Too many power lines may hurt people around and inconvenient pedestrians, and causes higher cost. The primary objective of the present invention is to provide a power system, which is applied to portable electrical tools. The power system comprises: a power unit; a portable electrical tool having a power line, which is electrically connected to the power unit; a power-store device being electrically connected to the power unit; wherein the power unit provides power to the portable electrical tool and the power-store device, a battery of the power-store device is electrically connected to the power unit in serial connection in order to make that a voltage value of the battery is the same as a voltage value of the power unit, so that the power-store device provides the voltage same as the voltage of the power unit to the portable electrical tool without additional transformer, which is to step up or down the voltage for meeting usages of charging the power-store device or supplying the power from the power-store device to the portable electrical tool, the power-store device stores the power simultaneously, so that the power-store device provides the power to the portable electrical tool while the portable electrical tool is operated outdoors. As compared with the prior arts, the present invention has the advantages listed below:
1. Power lines are no more needed to prevent happening dangers, and the cost is saved.
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